
ECSS-E-ST-31-02C
12 December 2012
24
Table 5-1: Categories of two-phase heat transport equipment according to heritage
(derived from ECSS-E-ST-10-02C, Table 5-1)
Category
Description Qualification programme
Remarks related to the present
Standard
A Off-the-shelf product without
modifications and
The product is qualified to
requirements at least as severe as
those imposed by the actual
technical specification
The product is produced by the
same manufacturer and using
identical tools and manufacturing
processes
None
B Off-the-shelf product without
modifications.
However:
The product is qualified to
requirements less severe or
different to those imposed by the
actual technical specification
Or
The product is produced by a
different manufacturer or using
different tools and manufacturing
processes
Or
The product has substitution parts
and materials with equivalent
reliability *)
Delta qualification
programme, decided on a
case-by-case basis in
agreement between the
customer and the supplier
This category relates for example to
TPHTE hardware, which is identical
to already qualified hardware but has
been qualified to lower mechanical
loads or narrower operating
temperature ranges as required by an
actual project.
The category relates also to situations,
where TPHTE manufacturing
technology is transferred from a
qualified supplier to a new
manufacturer.
*) Any substitution parts and
materials fulfilling the same
procurement specification does not
require delta-qualification.
C Off-the-shelf product with design
modifications
Delta or full qualification
programme, decided on a
case-by-case basis depending
on the impact of the
modification in agreement
between the customer and the
supplier
Examples for category C are:
Heat pipes with identical capillary
structure but different diameters,
smaller bent radius,
CDL with different fluid line
configurations or dimensions or
different condenser configurations
D New designed and developed product. Full qualification programme. Applicable for any new developed
TPHTE, including existing systems
with new capillary structures or